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Finding the Fourth Proportional to 1,390.93, 1,918.02 and 866.05

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Solution

The fourth proportional to 1,390.93, 1,918.02 and 866.05 is: 1,194.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.93 : 1,918.02 = 866.05 : x
  2. Step 2: Convert to fraction form
    1,390.93/1,918.02 = 866.05/x
  3. Step 3: Cross multiply
    1,390.93x = 1,918.02 × 866.05
  4. Step 4: Simplify right side
    1,390.93x = 1,661,101.22
  5. Step 5: Solve for x
    x = 1,661,101.22/1,390.93
  6. Step 6: Final answer
    x = 1,194.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.